Category Archives: #off road vehicles

Installation and modification of A/C systems for US and imported vehicles


By Ward Atkinson Members have requested information regarding requirements that apply to vehicles produced by OEM vehicle manufacturers, commercial upfitters and independent A/C repair or service facilities that install or modify mobile A/C systems. All A/C refrigerants listed as acceptable, … Continue reading

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Spin-On Coolant Filters


By Chris Tyson, MACS Heavy Duty Contributor While rarely seen in automotive and light truck systems, engine coolant filters (sometimes called water filters) can be found on many over-the-road, heavy duty truck and off-road engine cooling system applications. While most … Continue reading

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The new world of HD and off-road equipment cooling


By Jerry Lemon, Lemco Mobile AC Consulting Welcome to the new world of HD and off-road air conditioning. There was a time, not that long ago, when the HVAC system in a piece of heavy equipment, or an over-the-road (OTR) … Continue reading

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Section 609 important information


If you still have questions about Section 609 certification please review our list of frequently asked questions by clicking here.    

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MACS Training Clinic in Watertown, SD


Many thanks to MACS member Lake Area Technical Institute for hosting a capacity crowd at their training center Friday, March 23 for a MACS mobile A/C heavy duty best practices class. MACS training classes are happening all Spring see the … Continue reading

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Tata Motors and MAHLE partner together to develop a prototype Secondary Loop Mobile Air Conditioning System on a vehicle


Tata Motors Limited and MAHLE, one of the world’s 20 largest suppliers to the automotive industry, have signed a joint development agreement for designing and developing a Secondary Loop Mobile Air Conditioning System (SL–MAC), under the aegis of United Nations … Continue reading

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MACS AG HVAC clinic in Norfolk, NE


MACS held our first ever agricultural HVAC clinic at MACS member Northeast Community College in Norfolk, NE on Friday, March 24 attended by 31 technicians. MACS wants to thank Doug McKibbon of Northeast Community College for his invitation to use … Continue reading

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Truck heater control valves


By Chris Tyson, MACS heavy duty contributor We have several Class 8 trucks in our fleet and when temperatures begin to drop outside many of their owners visit our shop for heater-related repairs. That’s exactly what happened when the operator … Continue reading

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New EPA rule allows R-1234yf in certain trucks


By Steve Schaeber, MACS Technical Editor If you’ve been waiting to see R-1234yf in something larger than a ½ ton pickup truck, you might not have to wait too much longer. A new EPA rule that was just signed last … Continue reading

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A fleet for field work: servicing specialty equipment


By Stephen Petit, Siefkes/Petit Communications In heavy-duty A/C work, the service vehicle is essentially a shop on wheels — it’s vital for reaching equipment that operates virtually around the clock or can never see the highway. NVB Equipment in Fresno, … Continue reading

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